I'd like to tune a Strat a whole step down, and I was wondering what gauge of strings I should use to get the same tension that I get in normal tuning with .010 strings.
I'd try .011s. Because they're heavier than .010s, they'll have higher tension, which might be enough to compensate for tuning them down a step. But perhaps more importantly, they'll have a plain third string rather than a wound one, which will help keep the feel similar to the feel of the .010s. I've tried .012s, but the wound third string feels very different.